Respiratory syncytial virus (RSV) is a common respiratory illness that affects people of all ages but can be especially concerning for infants, young children, older adults, and those with weakened immune systems. Many people associate RSV with fever, but not everyone who has RSV develops a temperature. This often raises an important question: Is RSV contagious without fever? The answer is yes, RSV can be contagious even if a person does not have a fever ...